Wear pack for a demolition tool

ABSTRACT

A wear pack is disclosed for shielding a front end of a jaw set of a demolition tool. The wear pack may have a position portion provided on a bracket member for the alignment thereof prior to mounting. The wear pack may have a force transfer portion provided on the bracket member for the transfer of demolition forces to the front end of the jaw. The positioning portion may be contiguous with the force transfer portion.

TECHNICAL FIELD

This disclosure relates to the field of demolition tools for crushing and/or cutting material and more particularly to the field of wear packs for demolition tools.

BACKGROUND

A demolition tool for crushing and/or cutting material is generally known. Typically, the demolition tool may comprise a jaw set having a lower jaw and an upper jaw. The upper and lower jaws may be pivotally connected. The upper and lower jaws may be moveable relative to each other. Blades may be provided on both the upper jaw and the lower jaw. The work material may be crushed or cut by closing the upper jaw against the lower jaw under hydraulic pressure.

The demolition tool may comprise a frame that connects the jaw set to a jib of a machine.

The demolition tool may have a jaw set that is suitable for crushing concrete. The jaw set may be adapted for crushing or cutting other materials, for example for cutting scrap iron and/or iron sections. The abrasive nature or hardness of some of these materials may cause the relatively rapid wear of the surfaces that engage the materials.

The demolition tool may be provided with replaceable wear parts that have wear surfaces. A type of replaceable wear part may be a wear pack. The wear pack may be connected directly to the jaw set by conventional techniques. The wear pack may be provided on the upper and/or the lower jaw. The wear pack may be retained by fasteners that are exposed to relatively high stresses during operation.

The present disclosure is directed, at least in part, to improving or overcoming one or more aspects of the prior art system.

BRIEF SUMMARY OF THE INVENTION

In a first aspect, the present disclosure describes a wear pack for a jaw of a demolition tool, the wear pack may comprise a wear member for shielding a front end of the jaw, the wear member having a contact surface to rest against the front end; and a bracket member projecting from the wear member for coupling the front end and having a mounting surface configured for mating to a reciprocal mounting surface on the front end, wherein the mounting surface comprises a positioning portion contiguous with a force transfer portion.

In a second aspect, the present disclosure describes a method of assembling a wear pack on a jaw of a demolition tool, the method comprising the steps of providing a wear member for shielding the front end of the jaw, the wear member having a contact surface to rest against the front end; providing a bracket member projecting from the wear member and having a mounting surface configured for mating a reciprocal mounting surface on the front end, the mounting surface having positioning portion contiguous with a force transfer portion; and engaging the positioning portion to a reciprocal positioning portion on the reciprocal mounting surface.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features and advantages of the present disclosure will be more fully understood from the following description of various embodiments, when read together with the accompanying drawings, in which:

FIG. 1 is an isometric view of a wear pack according to the present disclosure;

FIG. 2 is an isometric view of a wear pack of FIG. 1 mounted to a jaw set of a demolition tool;

FIG. 3 is a cross-section view of the wear pack mounted to the jaw set in FIG. 2;

FIG. 4 is an isometric view of a second embodiment of a wear pack according to the present disclosure; and

FIG. 5 is a cross-section view of the wear pack of FIG. 4 mounted to a jaw set

FIG. 6A is a cross-section view of a wear pack of FIG. 1 in an approach to the jaw set of a demolition tool;

FIG. 6B is a cross-section view of a wear pack of FIG. 1 in an initial engagement with the jaw set;

FIG. 6C is a cross-section view of a wear pack of FIG. 1 rotated at the point of initial engagement relative to the jaw set;

FIG. 6D is a cross-section view of a wear pack of FIG. 1 at the end of rotation relative to the jaw set.

DETAILED DESCRIPTION

This disclosure generally relates to a wear pack 10 for assembly onto a jaw set of a demolition tool.

FIG. 1 illustrates the wear pack 10. The wear pack 10 may be composed of a material or a composite of materials that are resistant to wear due to operation of the demolition tool. The wear pack 10 may be composed of high strength steel.

FIG. 2 illustrates the wear pack 10 mounted to a jaw set 50 of a demolition tool. Although the wear pack 10 is shown mounted to a jaw 52 of the jaw set 50, the present disclosure should not to be limited to this embodiment.

The wear pack 10 may be configured to fit to an upper jaw 51 or the lower jaw 52 of the jaw set 50. The wear pack 10 may be configured to fit to a front end 53 of the jaw 51 or a front end 54 of the jaw 52. The front ends 53, 54 may be the free ends that are opposite the pivotally connected ends of the jaws 51, 52.

With reference to FIG. 1, the wear pack 10 may comprise a wear member 12. The wear member 12 may have a shape which corresponds to the front end 54. The wear member 12 may be adapted to shield the front end 54. The wear member 12 may have a shape and dimension suitable to contact and protect the front end 54. The wear member 12 may be suitably modified so as to contact and protect the front end 54.

In an embodiment. the wear member 12 may be elongated and may have a substantially rectangular shape. In an embodiment. the wear member 12 may be formed as a plate.

The wear member 12 may have a contact surface 13. The contact surface 13 may be formed on a side of the wear member 12. The contact surface 13 may be formed across the entire side of the wear member 12.

In an embodiment, the contact surface 13 may be formed on a portion of the side of the wear member 12. In an embodiment, the contact surface 13 may be a body that protrudes from the wear member 12.

The contact surface 13 may rest against the front end 54. The contact surface 13 may have a shape and dimension suitable to rest against and protect the front end 54. The contact surface 13 may be suitably modified to rest against and protect the front end 54 of a specific jaw set.

The wear member 12 may have a first indent 30. The first indent 30 may be formed on an edge of the wear member 12. With the wear member 12 having a substantially rectangular shape, the first indent 30 may be formed on a longer edge and may be centrally positioned. The shape and dimension of the first indent 30 may correspond to an indented portion on the front end 54.

In an embodiment, the first indent 30 may have a straight centre segment that is connected between inclined end segments. The centre segment may be parallel to the longitudinal axis of the wear member 12. The end segments may be inclined relative to the longitudinal axis of the wear member 12.

The wear member 12 may have a pair of first bosses 31 positioned on the same edge of the wear member 12 having the first indent 30. The first bosses 31 may be disposed on either side of the first indent 30. The first bosses 31 may be spaced from the first indent 30. In an embodiment, the first bosses 31 may flank the first indent 30 such that the inclined end segments are continuos with the first bosses 31.

The wear member 12 may have a second indent 32. The second indented 32 may be formed on an edge of the wear member 12 opposite to the edge having the first indent 30. The second indent 32 may be centrally positioned. The shape and dimension second indent 32 may correspond to an additional indented portion on the front end 54.

In an embodiment, the second indent portion 32 may have a straight centre segment that is connected between inclined end segments. The centre segment may be parallel to the longitudinal axis of the wear member 12. The centre segment of the second indent 32 may be parallel to the centre segment of the first indent 30. The end segments may be inclined relative to the longitudinal axis of the wear member 12.

The wear member 12 may have a pair of second bosses 34 positioned on the same edge of the wear member 12 having the second indent 32. The second bosses 34 may be disposed on either side of the second indent 32 such that each inclined end segment forms a side of each second boss 34. In an embodiment, the second bosses 34 may be spaced from the second indent 32.

The wear pack 10 may have a bracket member 16. The bracket member 16 may enable the wear pack 10 to be mounted to the front end 54. In an embodiment, the bracket member 16 may be formed as a block.

The bracket member 16 may be connected to the wear member 12. The bracket member 16 may be suitably positioned at the wear member 12. In an embodiment, the bracket member 16 may be laterally connected to the wear member 12. A bracket side wall 15 of the bracket member 16 may be connected to the wear member 12.

An end of the bracket member 16 may be a free end 24 that is not connected to the wear member 12. The opposite end of the bracket member 16 may be connected to the wear member 12. The opposite end of the bracket member 16 may be laterally connected to the wear member 12 at the bracket side wall 15. The bracket member 16 may be welded to the wear member 12. In an embodiment, the bracket member 16 may be cast moulded with the wear member 12.

In an embodiment, the bracket member 16 may have a longitudinal axis extending from the free end 24 to the opposite end.

In an embodiment, the bracket member 16 may be connected to an edge of the wear member 12 that is adjacent to the edges having the first indent 30 and the second indent 32.

The bracket member 16 may project from the wear member 12. The bracket member 16 may project form the wear member 12 and the free end 24 may extend beyond contact surface 13.

In an embodiment. the bracket member 16 may be inclined relative to the wear member 12. The longitudinal axis of the bracket member 16 may be at an angle of less than 90° relative to the contact surface 13.

A mounting surface 43 may be formed on the bracket member 16. The mounting surface 43 may be configured for mating to front end 54. The mounting surface 43 may be formed on a side of the bracket member 16. The mounting surface 43 may extend from the free end 24 to the end laterally connected to the wear member 12.

In an embodiment, the mounting surface 43 may be formed on the bracket member 16 at the side adjacent to the bracket side wall 15.

The mounting surface 43 may comprise a positioning portion 40 and a force transfer portion 42. The positioning portion 40 may enable the wear member 12 to be disposed relative to the front end of the jaw in a position for mutual engagement. The force transfer portion 42 may serve transfer the crushing forces which arise during operation of the demolition tool to the jaw set of the demolition tool.

The positioning portion 40 may be located adjacent to the force transfer portion 42 on the mounting surface 43. The positioning portion 40 may be contiguous with force transfer portion 42.

The force transfer portion 42 may precede the positioning portion 40 with reference to contact surface 13. The force transfer portion 42 may be located adjacent the end laterally connected to the wear member 12. The positioning portion 40 may be located adjacent the free end 24.

The relative geometry between the position potion 40 and force transfer portion 42 may be configured such that the reciprocal inclination between the position potion 40 and force transfer portion 42 is not substantially 90° relative to the contact surface 13. The reciprocal inclination between the position potion 40 and force transfer portion 42 may enable demolition forces to be transferred to the front end 54 while retaining mounting surface 43 in mating engagement with the front end 54.

In an embodiment, the angle of the reciprocal inclination between the position potion 40 and force transfer portion 42 relative to the contact surface 13 may be between 0° to 85°. In an embodiment, the angle of the reciprocal inclination between the position potion 40 and force transfer portion 42 relative to the contact surface 13 may be between 95° to 180°.

The force transfer portion 42 may be disposed across the bracket member 16 extending from the bracket side wall 15 to the opposite side. A longitudinal axis may extend along the surface of the force transfer portion 42. The longitudinal axis may extend from the bracket side wall 15 to the opposite side. In an embodiment, the longitudinal axis of the force transfer portion 42 may be perpendicular to the longitudinal axis of the bracket member 16.

The positioning portion 40 may be disposed across the bracket member 16 extending from the bracket side wall 15 to the opposite side. A longitudinal axis may extend along the surface of the positioning portion 40. The longitudinal axis may extend from the bracket side wall 15 to the opposite side. In an embodiment, the longitudinal axis of the positioning portion 40 may be perpendicular to the longitudinal axis of the bracket member 16.

A longitudinal axis extending along the positioning portion 40 may be parallel to a longitudinal axis extending along the force transfer portion 42.

A transition area may be formed between the positioning portion 40 and the force transfer portion 42. In an embodiment, the angle of the transition area between the position potion 40 and force transfer portion 42 relative to the contact surface 13 may be between 0° to 85°. In an embodiment, the angle of the transition area between the position potion 40 and force transfer portion 42 relative to the contact surface 13 may be between 95° to 180°.

The force transfer portion 42 may be formed such that there is a large contact area between the mounting surface 43 and the front end 54. The force transfer portion 42 may have a curved shape. The force transfer portion 42 may engage to a complementarily shaped portion on the front end 54.

FIG. 3 illustrates the wear pack 10 mounted to the front end 54. The mounting surface 43 may mate to the reciprocal mounting surface 57 of the front end 54. The force transfer portion 42 may be engage to the reciprocal force transfer portion 58. The force transfer portion 42 and the reciprocal force transfer portion 58 may have forms that are mutually matching. The force transfer portion 42 and the reciprocal force transfer portion 58 may have forms that enable their mutual engagement.

The force transfer portion 42 may have a cross section that is defined by a circular arc. The force transfer portion 42 and reciprocal force transfer portion 58 may have complementary cross sections defined by circular arcs.

With reference to FIGS. 1 and 3, in an embodiment, the force transfer portion 42 may be a concave groove. The concave circular arc of the force transfer portion 42 may be a segment of a virtual first circle 44. A central axis of the force transfer portion 42 which is parallel to a longitudinal axis thereof may extend through the centre of the virtual first circle 44.

The concave force transfer portion 42 may engage with the reciprocal force transfer portion 58 formed as a convex ridge. The convex ridge of the reciprocal force transfer portion 58 may fit in the concave groove of the force transfer portion 42.

In an embodiment, the force transfer portion 42 may be a convex ridge. The convex circular arc of the force transfer portion 42 may be a segment of a virtual first circle. A central axis of the force transfer portion 42 which is parallel to a longitudinal axis thereof may extend through the centre of the virtual first circle.

The convex force transfer portion 42 may engage with the reciprocal force transfer portion 58 formed as a concave groove. The convex ridge of the force transfer portion 42 may fit in the concave groove of the reciprocal force transfer portion 58.

The positioning portion 40 may be formed such that there is contact area between the mounting surface 43 and the front end 54 which allows the positioning of the wear pack 10 relative to the front end 54. The positioning portion 40 may engage to a complementarily shaped portion on the front end 54.

With reference to FIG. 3, the positioning portion 40 may be engaged to the reciprocal positioning portion 56. The positioning portion 40 and the reciprocal positioning portion 56 may have forms that are mutually matching. The positioning portion 40 and the reciprocal positioning portion 56 may have forms that enable their mutual engagement.

The positioning portion 40 may have a cross section that is defined by a circular arc. The positioning portion 40 and reciprocal positioning portion 56 may have complementary cross sections defined by circular arcs.

With reference to FIGS. 1 and 3, in an embodiment, the positioning portion 40 may be a convex ridge. The convex circular arc of the positioning portion 40 may be a segment of a virtual second circle 46. A central axis of the positioning portion 40 which is parallel to a longitudinal axis thereof may extend through the centre of the virtual second circle 46.

The convex positioning portion 40 may engage with the reciprocal positioning portion 56 formed as a concave groove. The convex ridge of the positioning portion 40 may fit in the concave groove of the reciprocal positioning portion 56.

In an embodiment, the positioning portion 40 may be a concave groove. The concave circular arc of the positioning portion 40 may be a segment of a virtual second circle. A central axis of the positioning portion 40 which is parallel to a longitudinal axis thereof may extend through the centre of the virtual second circle.

The concave positioning portion 40 may engage with the reciprocal positioning portion 56 formed as a convex ridge. The convex ridge of the reciprocal positioning portion 56 may fit in the concave groove of the positioning portion 40.

In an embodiment, the arc length of the force transfer portion 42 is greater than the arc length of the positioning portion 40.

In an embodiment, the central axis of the positioning portion 40 may be parallel to the central axis of the force transfer portion 42. In an embodiment, the reciprocal positioning portion 56 may have a central axis that is parallel to the positioning portion 40 when the wear pack 10 is mounted to the front end 54. The reciprocal force transfer portion 58 may have a central axis that is parallel to the force transfer portion 42 when the wear pack 10 is mounted to the front end 54.

An intersecting plane on the mounting surface 43 may be defined by a plane intersecting both the central axis of the positioning portion 40 and the central axis of the force transfer portion 42. An intersecting plane on the reciprocal mounting surface 57 may be defined by a plane intersecting both the central axis of the reciprocal positioning portion 56 and the central axis of the reciprocal force transfer portion 58. In an embodiment, the angle between the intersecting plane on the mounting surface 43 and the contact surface 13 may be equal to the angle between the intersecting plane on the reciprocal mounting surface 57 and a reciprocal contact surface 59.

The central axis of the positioning portion 40 may represent the rotational axis of the wear pack 10. The bracket member 16 may rotate about the rotational axis relative to the front end 54.

The wear pack 10 may further comprise an abutment member 20. With reference to FIG. 3, the abutment member 20 may co-operate with the bracket member 16 as a receiving pair to interposingly receive a section of the front end 54.

With reference to FIG. 1, the abutment member 20 may project from the wear member 12. In an embodiment, the bracket member 16 may be formed as a plate.

The abutment member 20 may be connected to the wear member 12. The abutment member 20 may be suitably positioned at the wear member 12. In an embodiment, the abutment member 20 may be laterally connected to the wear member 12. An abutment side wall 21 of the abutment member 20 may be connected to the wear member 12.

An end of the abutment member 20 may be an abutment end 26 that is not connected to the wear member 12. The opposite end of the abutment member 20 may be connected to the wear member 12. The opposite end of the abutment member 20 may be laterally connected to the wear member 12 at the abutment side wall 21. The abutment member 20 may be welded to the wear member 12. In an embodiment, the abutment member 20 may be cast moulded with the wear member 12.

In an embodiment, the abutment member 20 may have a longitudinal axis extending from the abutment end 26 to the fixed opposite end.

In an embodiment, the abutment member 20 may be connected to an edge of the wear member 12 that is adjacent to the edges having the first indent 30 and the second indent 32. In an embodiment, the abutment member 20 may be connected to the same edge of the wear member 12 connected to the bracket member 16. The abutment member 20 may be disposed on the wear member 12 to be directly opposite the bracket member 16. The abutment member 20 and the bracket member 16 may be mutually opposed on the wear member 12.

The abutment member 20 may project from the wear member 12. The abutment member 20 may project form the wear member 12 and the abutment end 26 may extend beyond contact surface 13.

An abutment surface 27 may be formed on the abutment member 20. The abutment surface 27 may be configured for engaging to a portion of the front end 54. The abutment surface 27 may be formed on a side of the abutment member 20. The abutment surface 27 may extend from the abutment end 26 to the end laterally connected to the wear member 12.

In an embodiment, the abutment surface 27 may be formed on the abutment member 20 at the side adjacent to the abutment side wall 21. In an embodiment, the abutment surface 27 may be perpendicular to the contact surface 13. In an embodiment, the abutment surface 27 may be inclined to the contact surface 13.

With reference to FIG. 3, the abutment surface 27 may abut a reciprocal abutment surface 60 formed on the front end 54. The abutment surface 27 and the reciprocal abutment surface 60 may be formed to be mutually corresponding. The abutment end 26 may abut against a limit surface 62 on the front end 54. The abutment end 26 and the limit surface 62 may be formed to be mutually corresponding. The free end 24 of the bracket member 16 may be formed further from the contact surface 13 than the abutment end 26.

In an embodiment, the line R may extend from the central axis of the positioning portion 40 to the reciprocal abutment surface 60. Line R may represent a radius extending from the rotational axis of the wear pack 10 to an area on the front end that is cleared by the abutment member 20 when the wear pack 10 is mounted or dismounted. The length of line R may define the distance of the abutment member 20 from the central axis of the positioning portion 40. The length of line R may define minimum distance of the abutment surface from the central axis of the positioning portion 40. A transition portion 29 may be formed between the abutment surface 27 and the contact surface 13. The transition portion 29 may be formed to rest against the reciprocal abutment surface 60. The transition portion 29 and the reciprocal abutment surface 60 may have complementary shapes and dimension for mutual engagement.

In an embodiment, the angle between the abutment surface 27 and the contact surface 13 may be equal to the angle between reciprocal abutment surface 60 and the reciprocal contact surface 59. In an embodiment, the angle of the abutment surface 27 relative to the wear member 12 may be provided such that the wear pack 10 may be mounted on to the front ends 53 and removed therefrom by rotation of the wear pack 10 about the rotation axis.

With reference to FIG. 1, the wear pack 10 may comprise a second bracket member 16 and a second abutment member 20. The second bracket member 16 and the second abutment member 20 may cooperate as a second receiving pair to interposingly receive a section of the front end 54. The second bracket member 16 and the second abutment member 20 may be spaced from the first receiving pair. The first and second receiving pairs may be formed on opposite ends of the wear member 12 adjacent to the edges having the first and second indents 30, 32.

The wear pack 10 may further comprise mutually opposed side plates 18 wherein each side plate 18 may be connected to the first and second receiving pair. The side plates 18 may be perpendicular to the contact surface 13.

In an embodiment, the contact surface 13 may extend to the side plates 18. The side of the force transfer portion 42 may be level with the contact surface 13. The circular arc of the force transfer portion 42 may terminate at the contact surface 13. The force transfer portion 42 may be bordered on opposed sides by the positioning portion 40 and the contact surface 13.

The side plates 18 may be connected at an end to the bracket members 16. At opposite ends the side plates 18 may be connected to the abutment members 20. A free plate side 22 may be contiguous with the free ends 24 of the bracket members 16. The plate side opposite the free plate side 22 may be connected to the wear member 12. The free plate side 22 may be formed further from the contact surface 13 than the abutment end 26. The side plates 18 may comprise rounded plate edges 28 between the free plate sides 22 and the ends connected to the abutment members 20.

The side plates 18 may comprise apertures 36. The apertures 36 may be located on each side plate 18 adjacent to each abutment member 20.

In an embodiment, each side plate 18, abutment member 20 and bracket member 16 may be integrally formed as a wear end 14. The wear pack 10 may comprise a pair of wear ends 14 disposed at either ends of the wear member 12. The wear ends 14 may be formed on opposite ends of the wear member 12 adjacent to the edges having the first and second indents 30, 32.

With reference to FIG. 2, the wear ends 14 may rest against the sides of the front ends 54. The wear ends 14 may protect the sides of the front end 54. The apertures 36 may enable a retaining bolt 38 to be inserted through the side plates 18 into the front end 54

The retaining bolt 38 may not clamp onto the side plates 18. When the retaining bolts 38 may be secured into the front end 54 the bolt heads may be flush with the side plates 18. The bolt heads may have a smaller diameter than the apertures 36 in the side plates 18 allowing play between the retaining bolts 38 and the side plates 18. The wear pack 10 may be retained at the front end 54 by the side plates 18 in the loose abutting engagement with the bolt heads of the retaining bolts 38.

The wear ends 14 may have base members 19 extending in a direction away from the free ends 24, free plate sides 22 and abutment ends 26. The base members 19 may provide wear surfaces that may contact materials to be crushed or cut. The front edge 54 may be provided with a groove 64 to ensure clearance between the wear pack 10 and the front end 54.

FIG. 4 illustrates a second embodiment of the wear pack 10. The portions of the contact surface 13 adjacent to the side plates 18 may be recessed into the wear ends 14 forming recessed portions 11. The recessed portions 11 may extend into wear ends 14 in a direction parallel to the side plates 18.

The recessed portions 11 may be not be level with the force transfer portion 42. The circular arc of the force transfer portion 42 may terminate at the contact surface 13. The force transfer portion 42 may be bordered on opposed sides by the positioning portion 40 and the contact surface 13.

With reference to FIG. 5, the recessed portions 11 may not be in contact with the reciprocal mounting surface 59 when the wear pack is mounted on the front end 54. The force transfer portion 42 may still engage to the reciprocal force transfer portion 58 as described above. The reciprocal mounting surface 59 may still be in contact with the mounting surface 13 as described above.

With reference to FIG. 6A, method of assembling a wear pack 10 on the jaw 52 of a demolition tool may comprise the following steps. The wear member 12 may be provided to shield the front end 54. The wear member 12 may have a contact surface 13 to rest against the front end 54. The bracket member 16 may be provided to project from the wear member 12 and to have a mounting surface 43 that is configured for mating the reciprocal mounting surface 57 on the front end 54. The mounting surface 43 may have a positioning portion 40 that is contiguous with a force transfer portion 42.

The wear pack 10 may be brought into alignment with the front end 54. The wear pack 10 may be aligned such that the intersecting plane on the mounting surface 43 may be inclined relative to the intersecting plane on the reciprocal mounting surface 57. The positioning portion 40 may be brought into a position to engage the reciprocal positioning portion 56.

With reference to FIG. 6B, the positioning portion 40 may be engaged to the reciprocal positioning portion 56 at an engagement point. At engagement of the positioning portion 40 to the reciprocal positioning portion 56, the force transfer portion 42 may be aligned to engage the reciprocal force transfer portion 58. The contact surface 13 may be aligned to engage the reciprocal contact surface 59. The abutment surface 27 may be aligned to slidingly engage the reciprocal abutment surface 60.

With reference to FIG. 6C, the bracket member 16 may be rotated towards the front end 54 at the engagement point of the positioning portion 40 and the reciprocal positioning portion 56. The bracket member 16 may be rotated about the rotation axis of the wear pack 10.

In an embodiment, the positioning portion 40 and the reciprocal positioning portion 56 may have complementary cross sections defined by circular arcs. In an embodiment, the positioning portion 40 may be a convex ridge and the reciprocal positioning portion 56 may be a concave groove.

The rotation of the bracket member 16 may move the force transfer portion 42 closer to the reciprocal force transfer portion 58. The contact surface 13 may move closer to the reciprocal contact surface 59. The abutment surface 27 may move closer to the reciprocal abutment surface 60. The abutment surface 27 may slidingly engage the reciprocal abutment surface 60. The abutment member 20 may approach the limit surface 62.

With reference to FIG. 6D, the bracket member 12 may be rotated to a point the abutment member 20 abuts against the limit surface 62 on the front end 54. The bracket member 12 may no longer undergo further rotation.

At abutment of the abutment member 20 against the limit surface 62, the force transfer portion 42 may engage to the reciprocal force transfer portion 58. The contact surface 13 may be engaged to the reciprocal contact surface 59. The transition portion 29 may rest against the reciprocal abutment surface 60. The aperture 36 may be aligned to a reciprocal aperture 39 that is formed on the front end 54.

In an embodiment, the force transfer portion 42 and the reciprocal force transfer portion 58 may have complementary cross sections defined by circular arcs. In an embodiment, the force transfer portion 42 may be a concave groove and the reciprocal force transfer portion 58 may be a convex ridge.

The retaining bolt 38 may be inserted through the aperture 36 and the reciprocal aperture 39.

The method may be reversed to dismount the wear pack 10 from the front end 54. Initially, the retaining bolt 38 may be removed from the aperture 36 and the reciprocal aperture 39. The bracket member 16 may be rotated about the rotation axis to rotate the wear pack 10 relative to the front end 54. The contact surface 13 may be rotated away from the reciprocal contact surface 59. Upon clearance of the abutment surface 27 with respect to the reciprocal abutment surface 60, the positioning portion 40 may be disengaged from the reciprocal positioning portion 56 on the reciprocal mounting surface 57.

The skilled person would appreciate that foregoing embodiments may be modified or combined to obtain the wear pack 10 of the present disclosure.

INDUSTRIAL APPLICABILITY

This disclosure describes a wear pack 10. The wear pack 10 may be mounted to the jaw set 50 of a demolition tool such as multiprocessors, pulverizers, crushers and other demolition tools that may have a jawset or grapple tine which have closing movements. The wear pack 10 may be mounted to the front end 53 of the upper jaw 51 or the front end 54 of the lower jaw 52. The wear pack 10 may shield the front ends 53, 54 from wear during demolition operations such as crushing or cutting of materials.

The wear pack 10 may have a positioning portion 40 to aid in the alignment and engagement thereof to the front ends 53, 54. The positioning portion 40 may initially engage to the reciprocal positioning portion 56 thereby aligning the other surfaces of the wear pack 10 to the reciprocal surfaces of the front end 54 for mutual engagement.

The wear pack 10 may have a force transfer portion 42 to aid in the transfer of forces generated in the demolition of materials into the front ends 53, 54. The force transfer portion 42 may engage with the reciprocal force transfer portion 58 such that a large mutual contact surface is formed for the transfer of demolition forces. The rest of the wear pack may be subject to minimal demolition forces. The wear pack 10 may be mounted to the front ends 53, 54 through rotation about an axis of rotation that corresponds to the centre axis of the positioning portion 40. The distance from the centre axis of the positioning portion 40 to an abutment surface of the front end 54 may be used to determine the form and dimension of the wear pack 10 in relation to the abutment members 20 for the clearance of the wear pack 10 at the reciprocal abutment surface 60 which represents the part of the front end 54 furthest from the reciprocal mounting surface 57.

The wear pack 10 may be easily and efficiently mounted on and dismounted from the front ends 53, 54. Once a wear pack 10 is spent due to operation of the demolition tool, the wear pack 10 may be easily replaced with a substitute wear pack 10.

Accordingly, this disclosure includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the disclosure unless otherwise indicated herein.

Where technical features mentioned in any claim are followed by references signs, the reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, neither the reference signs nor their absence have any limiting effect on the technical features as described above or on the scope of any claim elements.

The disclosures in European Patent Application No. 11185300.8 from which this application claims priority are incorporated herein by reference.

One skilled in the art will realise the disclosure may be embodied in other specific forms without departing from the disclosure or essential characteristics thereof. The foregoing embodiments are therefore to be considered in all respects illustrative rather than limiting of the disclosure described herein. Scope of the invention is thus indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalence of the claims are therefore intended to be embraced therein. 

1. A wear pack for a jaw of a demolition tool, the wear pack comprising: a wear member for shielding a front end of the jaw, the wear member having a contact surface to rest against the front end; and a bracket member projecting from the wear member for coupling the front end and having a mounting surface configured for mating to a reciprocal mounting surface on the front end, wherein the mounting surface comprises a positioning portion contiguous with the force transfer portion.
 2. The wear pack according to claim 1 wherein the force transfer portion precedes the positioning portion with reference to contact surface.
 3. The wear pack according to claim 2 wherein an angle of the reciprocal inclination between the position potion and force transfer portion relative to the contact surface is between 0° to 85° or 95° to 180°.
 4. The wear pack according to claim 3 wherein the force transfer portion and the positioning portion have cross sections defined by circular arcs.
 5. The wear pack according to claim 4 wherein the arc length of the force transfer portion is greater than the arc length of the positioning portion.
 6. The wear pack according to claim 5 wherein the positioning portion is a convex ridge and the force transfer portion is a concave groove.
 7. The wear pack according to claim 6 wherein an axis extending along the force transfer portion is parallel to an axis extending along the positioning portion.
 8. The wear pack according to claim 7 further comprising an abutment member projecting from the wear member wherein the abutment member cooperates with the bracket member as a receiving pair to interposingly receive a section of the front end.
 9. The wear pack according to claim 8 wherein the abutment member and the bracket member are mutually opposed on the wear member
 10. The wear pack according to claim 9 further comprising a second bracket member and a second abutment member cooperating as a second receiving pair and being spaced from the first receiving pair.
 11. The wear pack according to claim 10 further comprising mutually opposed side plates wherein each side plate is connected to the first and second receiving pair.
 12. A method of assembling a wear pack on a jaw of a demolition tool, the method comprising the steps of: providing a wear member for shielding the front end of the jaw, the wear member having a contact surface to rest against the front end; providing a bracket member projecting from the wear member and having a mounting surface configured for mating a reciprocal mounting surface on the front end, the mounting surface having a positioning portion contiguous with a force transfer portion; and engaging the positioning portion to a reciprocal positioning portion on the reciprocal mounting surface.
 13. The method of claim 12 further comprising the step of rotating the bracket member to the front end at the engagement point of the positioning portion and the reciprocal positioning portion wherein the positioning portion and the reciprocal positioning portion have complementary cross sections defined by circular arcs.
 14. The method of claim 13 further comprising the step of abutting the abutment member against a limit surface on the front end.
 15. The method of claim 14 wherein the step of abutting the abutment member against a limit surface comprises engaging the force transfer portion to a reciprocal force transfer portion the reciprocal mounting surface wherein the force transfer portion and the reciprocal force transfer portion may have complementary cross sections defined by circular arcs. 